libobs-source-macro 5.0.1

Helper macro for libobs-sources
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

use proc_macro2::{Span, TokenStream};
use quote::quote;
use syn::{punctuated::Punctuated, token::Comma, Field, LitStr, MetaNameValue, Token};

use crate::docs::collect_doc;

pub fn obs_properties_to_functions(
    fields: &Punctuated<Field, Comma>,
    settings_getter: TokenStream,
) -> Vec<TokenStream> {
    let obs_properties = fields
        .iter()
        .filter_map(|f| {
            let attr = f.attrs.iter().find(|e| e.path().is_ident("obs_property"));

            attr.map(|a| (f, a))
        })
        .collect::<Vec<_>>();

    let mut functions = Vec::new();
    for (field, attr) in obs_properties {
        let field_type = &field.ty;
        let field_name = field.ident.as_ref().unwrap();

        let name_values: Punctuated<MetaNameValue, Token![,]> = attr
            .parse_args_with(Punctuated::parse_terminated)
            .unwrap_or_else(|_| {
                panic!(
                    "Field {} has invalid obs_property, should be name value",
                    field_name
                )
            });

        let type_t = &name_values
            .iter()
            .find(|e| *e.path.get_ident().unwrap() == "type_t")
            .expect("type_t is required for obs_property")
            .value;

        let type_t = match type_t {
            syn::Expr::Lit(e) => match &e.lit {
                syn::Lit::Str(s) => s.value(),
                _ => panic!("type_t must be a string"),
            },
            _ => panic!("type_t must be a string"),
        };

        #[allow(unused_variables)]
        let mut obs_settings_name = field_name.to_string();
        let pot_name = &name_values
            .iter()
            .find(|e| *e.path.get_ident().unwrap() == "settings_key");

        if let Some(n) = pot_name {
            obs_settings_name = match &n.value {
                syn::Expr::Lit(e) => match &e.lit {
                    syn::Lit::Str(s) => s.value(),
                    _ => panic!("setings_key must be a string"),
                },
                _ => panic!("settings_key must be a string"),
            };
        }

        let (_docs_str, docs_attr) = collect_doc(&field.attrs);

        let obs_settings_key = LitStr::new(&obs_settings_name, Span::call_site());
        let set_field = quote::format_ident!("set_{}", field_name);
        let type_t_str = type_t.as_str();
        let to_add = match type_t_str {
            "enum" => {
                quote! {
                    #(#docs_attr)*
                    pub fn #set_field(mut self, #field_name: #field_type) -> Self {
                        use num_traits::ToPrimitive;
                        let val = #field_name.to_i32().unwrap();

                        #settings_getter
                            .set_int_ref(#obs_settings_key, val as i64);

                        self
                    }
                }
            }
            "enum_string" => {
                quote! {
                    #(#docs_attr)*
                    pub fn #set_field(mut self, #field_name: #field_type) -> Self {
                        use libobs_wrapper::data::StringEnum;

                        #settings_getter
                            .set_string_ref(#obs_settings_key, #field_name.to_str());

                        self
                    }
                }
            }
            "string" => {
                quote! {
                    #(#docs_attr)*
                    pub fn #set_field<T: Into<libobs_wrapper::utils::ObsString> + Sync + Send>(mut self, #field_name: T) -> Self {
                        #settings_getter
                            .set_string_ref(#obs_settings_key, #field_name);
                        self
                    }
                }
            }
            "bool" => {
                quote! {
                    #(#docs_attr)*
                    pub fn #set_field(mut self, #field_name: bool) -> Self {
                        #settings_getter
                            .set_bool_ref(#obs_settings_key, #field_name);
                        self
                    }
                }
            }
            "int" => {
                quote! {
                    #(#docs_attr)*
                    pub fn #set_field(mut self, #field_name: i64) -> Self {
                        #settings_getter
                            .set_int_ref(#obs_settings_key, #field_name);
                        self
                    }
                }
            }
            _ => panic!(
                "Unsupported type_t {}. Should either be `enum`, `string`, `bool` or `int`",
                type_t
            ),
        };

        functions.push(to_add);
    }

    functions
}